How long could person have kidney cancer before he died

I'm just wondering.. Recently, a man over 65 died on cancer. Originally it was kidney cancer but it has spread to other parts of body such as spine. He had some back pains since Autumn 2023 that made him go to doctor. He was diagnosed on the beginning of this year - stage 4.

How long he could had the cancer in his body? I mean in terms of years since it developed.